IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: In a plant cell, DNA may be found in 1924 0

  • 1
    only in the nucleus and mitochondria.
    सही
    गलत
  • 2
    only in the nucleus and chloroplasts
    सही
    गलत
  • 3
    in the nucleus, mitochondria, and chloroplasts.
    सही
    गलत
  • 4
    only in the nucleus.
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 3. "in the nucleus, mitochondria, and chloroplasts."
व्याख्या :

Answer: C) in the nucleus, mitochondria, and chloroplasts. Explanation: All of the genetic information in a cell was initially thought to be confined to the DNA in the chromosomes of the cell nucleus. It is now known that small circular chromosomes, called extranuclear, or cytoplasmic, DNA, are located in two types of organelles found in the cytoplasm of the cell. These organelles are the mitochondria in animal and plant cells and the chloroplasts in plant cells. Chloroplast DNA (cpDNA) contains genes that are involved with aspects of photosynthesis and with components of the special protein-synthesizing apparatus that is active within the organelle. Mitochondrial DNA (mtDNA) contains some of the genes that participate in the conversion of the energy of chemical bonds into the energy currency of the cell—a chemical called adenosine triphosphate (ATP)—as well as genes for mitochondrial protein synthesis.

प्र: Find the odd one in the given series ? 5-20-25, 10-40-50, 4-15-24, 25-100-125 1922 0

  • 1
    4-15-24
    सही
    गलत
  • 2
    5-20-25
    सही
    गलत
  • 3
    10-40-50
    सही
    गलत
  • 4
    25-100-125
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 1. "4-15-24"
व्याख्या :

Answer: A) 4-15-24 Explanation: In each term second two numbers are multiples of the first number. But in 4-15-24 15 is not multiple of 4.

प्र: Antonym for Durable 1922 0

  • 1
    Pressure
    सही
    गलत
  • 2
    Flimsy
    सही
    गलत
  • 3
    Hard-wearing
    सही
    गलत
  • 4
    Withstand
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 2. "Flimsy"
व्याख्या :

Answer: B) Flimsy Explanation: Durable means able to withstand wear, pressure.   Antonyms for Durable are Delicate, Flimsy, Short-lived.

प्र: The First step of Bacterial Replication is 1922 0

  • 1
    Pinching of the plasma membrane
    सही
    गलत
  • 2
    Separation of daughter cells
    सही
    गलत
  • 3
    Attachment of the DNA to the plasma membrane
    सही
    गलत
  • 4
    DNA Replication
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 4. "DNA Replication"
व्याख्या :

Answer: D) DNA Replication Explanation: The First step of Bacterial Replication is DNA Replication. DNA must be copied in order to proceed.

  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 2. "100"
व्याख्या :

Answer: B) 100 Explanation: Let the Efficiency of pavan be E(P) Let the Efficiency of sravan be E(S) Here Work W = LCM(25,20) = 100 Now, E(P+2S) = 100/25 = 4 ....(1) E(2P+S) = 100/20 = 5 ....(2) Hence, from (1) & (2) we get E(S) = 1 => Number of days Savan alone work to complete the work  = 100/1 = 100 days.

प्र: Which of the following is not a fossil fuel? 1921 0

  • 1
    Natural Gas
    सही
    गलत
  • 2
    Uranium
    सही
    गलत
  • 3
    Coal
    सही
    गलत
  • 4
    Petroleum
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 2. "Uranium"
व्याख्या :

Answer: B) Uranium Explanation: Uranium is not a fossil fuel whereas coal, petroleum and natural gas are all natural resources. Fossil fuels are hydrocarbons, primarily coal, fuel oil or natural gas, formed from the remains of dead plants and animals. In common dialogue, the term fossil fuel also includes hydrocarbon-containing natural resources that are not derived from animal or plant sources

प्र: Who has been appointed as the deputy director-general of World Health Organization (WHO) ? 1921 0

  • 1
    Dr. Soumya Swaminathan
    सही
    गलत
  • 2
    Rajat Nandan
    सही
    गलत
  • 3
    prof. Dr. Vikash Jha
    सही
    गलत
  • 4
    Sunil Narayan
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 1. "Dr. Soumya Swaminathan"
व्याख्या :

Answer: A) Dr. Soumya Swaminathan Explanation: The World Health Organization is a specialized agency of the United Nations that is concerned with international public health. It was established on 7 April 1948, Headquartered in Geneva, Switzerland. Dr Soumya Swaminathan has been appointed the deputy director general for programmes (DDP) of World Health Organisation (WHO). She also holds a key position as secretary in the department of health research, ministry of health and family welfare.

प्र: _ po _ mp _ n _ _ onmpo_. 1921 0

  • 1
    opmpnm
    सही
    गलत
  • 2
    mponpo
    सही
    गलत
  • 3
    mnompn
    सही
    गलत
  • 4
    mnopnm
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 3. "mnompn"
व्याख्या :

Answer: C) mnompn Explanation: The pattern 'mpon' is repeated.

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई